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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
9 Months Ended
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of components of other comprehensive income (loss)
The following tables present the components of other comprehensive income (loss) for the periods presented:

(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended September 30, 2024   
Net change in fair value of investment securities:   
Net unrealized gains on AFS investment securities arising during the period$27,092 $7,150 $19,942 
Amortization of unrealized losses on investment securities transferred to HTM1,920 507 1,413 
Net change in fair value of investment securities29,012 7,657 21,355 
Net change in fair value of derivatives:
Net unrealized losses arising during the period(4,317)(1,140)(3,177)
Net change in fair value of derivatives(4,317)(1,140)(3,177)
SERP:   
Amortization of net actuarial gain(2)(1)(1)
SERP(2)(1)(1)
Other comprehensive income$24,693 $6,516 $18,177 
(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended September 30, 2023   
Net change in fair value of investment securities:   
Net unrealized losses on AFS investment securities arising during the period$(24,729)$(6,569)$(18,160)
Reclassification adjustments from AOCI realized in net income135 36 99 
Amortization of unrealized losses on investment securities transferred to HTM2,026 538 1,488 
Net change in fair value of investment securities(22,568)(5,995)(16,573)
Net change in fair value of derivatives:
Net unrealized gains arising during the period3,151 838 2,313 
Net change in fair value of derivatives3,151 838 2,313 
SERP:   
Amortization of net actuarial gain(19)(7)(12)
Amortization of net transition obligation— 
SERP(17)(5)(12)
Other comprehensive loss$(19,434)$(5,162)$(14,272)
(dollars in thousands)Before TaxTax EffectNet of Tax
Nine Months Ended September 30, 2024   
Net change in fair value of investment securities:   
Net unrealized gains on AFS investment securities arising during the period$20,427 $5,391 $15,036 
Amortization of unrealized losses on investment securities transferred to HTM5,425 1,432 3,993 
Net change in fair value of investment securities25,852 6,823 19,029 
Net change in fair value of derivatives:
Net unrealized losses arising during the period(1,286)(340)(946)
Net change in fair value of derivatives(1,286)(340)(946)
SERP:  
Amortization of net actuarial gain(2)(1)(1)
SERP(2)(1)(1)
Other comprehensive income$24,564 $6,482 $18,082 
(dollars in thousands)Before TaxTax EffectNet of Tax
Nine Months Ended September 30, 2023   
Net change in fair value of investment securities:   
Net unrealized losses on AFS investment securities arising during the period$(17,675)$(4,696)$(12,979)
Reclassification adjustments from AOCI realized in net income135 36 99 
Amortization of unrealized losses on investment securities transferred to HTM5,670 1,506 4,164 
Net change in fair value of investment securities(11,870)(3,154)(8,716)
Net change in fair value of derivatives:
Net unrealized gains arising during the period$4,329 $1,139 $3,190 
Net change in fair value of derivatives4,329 1,139 3,190 
SERP:   
Amortization of net actuarial gain(58)(17)(41)
Amortization of net transition obligation
SERP(52)(15)(37)
Other comprehensive loss$(7,593)$(2,030)$(5,563)
Schedule of changes in each component of AOCI, net of tax
The following tables present the changes in each component of accumulated other comprehensive income (loss), net of tax, for the periods presented:

(dollars in thousands)Investment SecuritiesDerivativesSERPAOCI
Three Months Ended September 30, 2024   
Balance at beginning of period$(130,248)$7,260 $297 $(122,691)
Other comprehensive income (loss) before reclassifications19,942 (3,177)— 16,765 
Reclassification adjustments from AOCI1,413 — (1)1,412 
Total other comprehensive income (loss)21,355 (3,177)(1)18,177 
Balance at end of period$(108,893)$4,083 $296 $(104,514)

(dollars in thousands)Investment SecuritiesDerivativesSERPAOCI
Three Months Ended September 30, 2023   
Balance at beginning of period$(141,252)$5,522 $455 $(135,275)
Other comprehensive income (loss) before reclassifications(18,160)2,313 — (15,847)
Reclassification adjustments from AOCI1,587 — (12)1,575 
Total other comprehensive income (loss)(16,573)2,313 (12)(14,272)
Balance at end of period$(157,825)$7,835 $443 $(149,547)
(dollars in thousands)Investment SecuritiesDerivativesSERPAOCI
Nine Months Ended September 30, 2024   
Balance at beginning of period$(127,922)$5,029 $297 $(122,596)
Other comprehensive income (loss) before reclassifications15,036 (946)— 14,090 
Reclassification adjustments from AOCI3,993 — (1)3,992 
Total other comprehensive income (loss)19,029 (946)(1)18,082 
Balance at end of period$(108,893)$4,083 $296 $(104,514)

(dollars in thousands)Investment SecuritiesDerivativesSERPAOCI
Nine Months Ended September 30, 2023   
Balance at beginning of period$(149,109)$4,645 $480 $(143,984)
Other comprehensive income (loss) before reclassifications(12,979)3,190 — (9,789)
Reclassification adjustments from AOCI4,263 — (37)4,226 
Total other comprehensive income (loss)(8,716)3,190 (37)(5,563)
Balance at end of period$(157,825)$7,835 $443 $(149,547)

Schedule of amounts reclassified out of each component of AOCI
The following tables present the amounts reclassified out of each component of AOCI for the periods presented:

Amount Reclassified from AOCIAffected Line Item in the Statement Where Net Income is Presented
(dollars in thousands)Three Months Ended September 30,
Details about AOCI Components20242023
Sale of AFS investment securities:
Realized loss on sale of AFS investment securities$— $135 Net loss on sale of investment securities
Tax effect— (36)Income tax benefit
Net of tax— 99 
Amortization of unrealized losses on investment securities transferred to HTM:
Amortization1,920 2,026 Interest and dividends on investment securities
Tax effect(507)(538)Income tax benefit
Net of tax1,413 1,488 
SERP:   
Amortization of net actuarial gain(2)(19)Other operating expense - other
Amortization of net transition obligation— Other operating expense - other
Total before tax(2)(17)
Tax effectIncome tax expense
Net of tax(1)(12)
Total reclassification adjustments from AOCI for the period, net of tax$1,412 $1,575 
Amount Reclassified from AOCIAffected Line Item in the Statement Where Net Income is Presented
(dollars in thousands)Nine Months Ended September 30,
Details about AOCI Components20242023
Sale of AFS investment securities:
Realized loss on sale of AFS investment securities$— $135 Net loss on sale of investment securities
Tax effect— (36)Income tax benefit
Net of tax— 99 
Amortization of unrealized losses on investment securities transferred to HTM:
Amortization5,425 5,670 Interest and dividends on investment securities
Tax effect(1,432)(1,506)Income tax benefit
Net of tax3,993 4,164 
SERP:   
Amortization of net actuarial gain(2)(58)Other operating expense - other
Amortization of net transition obligation— Other operating expense - other
Total before tax(2)(52)
Tax effect15 Income tax expense
Net of tax(1)(37)
Total reclassification adjustments from AOCI for the period, net of tax$3,992 $4,226